Lens-drill.



A. E. IVIAYNARD.

LENS DRILL.

APPLxcATloN FILED APR. 3, 1914.

W M@ M f. M m w TTORfI/EYS ornibn.

UPTICAL COMPANY, 0F SOUTI-IBRIDGE, MASSACHUSETTS, A VOLUNTARY ASSOCIA- LENS-DRILL.

certain new and useful improvements in' Lens-Drills, of which the following is a specification.

My invention relates to improvements 1n 'drills and has particular reference to a drill for use in piercing glass or the like.

The leading object of my invention is the provision of an improved means for supplying lens drilling fluid or melange, as 1t' is commonly termed, to the point on. an ophthalmic'lens at which the aperture 1s to be formed.

A further object of my invention is the provision of an automatically operating melange feed for use in connection with an ophthalmic lens drill which will supply to the lens a predetermined amount of melange before the drill is brought into engagement therewith, and which will prevent the 'use of an undue amount of said fluid.

A. further object of my invention is the provision of an improved device of this character which may be adjusted to feed any desired amount of melange andl which may also be so operated as to feed an additional amount in any particular instance without interfering with the regular auto-y matically supplied quantity.

Other objects and advantages of my irn-y proved melange feed for .drills should be readily apparent by referenceto the following .specification taken in connectionw1th the accompanying drawings, and it will be understood that l may make any modifications in the specificv details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my inventlon.

Figure l represents a fragmentary perspective view of a drill equipped with my improved melange feed. Fig. lll represents a fragmentary vertical sectional-view of my device and the operating means carried in the adjacent portion of the drill arm. Fig. lll represents a perspective view partially in section illustrating the working parts of my invention.

ln the drawings, the numeral 1 denotes the frame for the lens drill having journaled therein the spindle 2 provided at its Speciiication of Letters Patent.

. rammed ang. sa, raie.

Application filed April 3, 1914. Serial No. 829,255.

lower end with the drilling point 3, a yoke or arm 4 operated by the handle 5 serving to control the vertical movement of the drill splndle. Disposed beneath the drill point 3 is a stand 6 and rest 7 for the lens 8 to be drllled. These parts, it will be understood, may be of any usual construction, not partlcularly entering into my invention.

ln the drilling of an ophthalmic lens it is desirable to make use of a small amount of drilling fluid or what is commonly termed melange, but as -this drilling is frequently done by the optician rather than by an ordinary shop Workman, it is desirable to make use of as small an amount of fluid as possible, both to prevent the same from being thrown "by the centrifugal force of the drill onto the operator or the adjacent parts of the drill itself. It is also desirable to keep the surface of thelens as clean as possible and free from the fluid to obviate the necessity for vthe purpose of my invention to automatically place a few drops of melange in correct position on the lens as the drill is moved downward into engagement therewith. To attain this result l preferably secure tothe drill frame-1 the tank 9 for the melange, which l have shown as provided with a pin 10 fitting into a slot 11 at the side of the frame and provided with a second threaded pin 12 fitting into another slot 13 of the frame, this second pin being provided with a thumb nut 14 which may be tightened to lock the reservoir in position.-

Formed in the bottom of the reservoir is an aperture to receive the bushing 15 having the melange receiving passage 16 at one sidev thereof, and having its bore of variable diameters. This bore comprises the enlarged portion 17 adapted to receive the plunger 18 and the actuating spring 19 `therefor, the large portion of the bore terminating in a shoulder 20, the diameter of the bore for a distance below the shoulder 20 being substantially that of the plunger i v 18 which makes a close fit therewith, this portion of the bore terminating ina seat 21 for the lower end 22 ofthe plunger, while below the seat`21 extends the outlet passage 23. The lower end of the bushing is preferably threaded to receive the cap 24 whichsecures 'in 'position the discharge. spout 25 looseningl of the cap permitting of adjust-v ing of the position of the spout 25 to accurately control `the point of discharge from the spout onto the-lens, but it will b e understood that if preferred the spout may be formed integral with the-bushing and theA coupling capg24 dispensed with.

noaably. held on the upper elle f the bushing is the female coupling v26, vinto which' threads the cap plug 27 having` the linterior shoulder 28 bearing againstv the washer 29 on the plunger and haying formed in one side the slot 30 adj a'centto` which are f the ears 31, between which is pivotally' supportedby thepin 32-the trip 33. This trip has the V-shaped outer portion'34 for env gagem'ent with the latch 35 and has its inner end slotted as at 36 to engage the pin, 37- of the plunger. The latch is. 4carried in a. Asocket inthe arm 4, being actuated byl the spring 38 and having its outward movement limited by the pin 39. l

Y drill point 3 into engagement with the lens tobe drilled, the latch 35 strikesthel end l34 vof the trip forcing the same downward, as

illustrated in Fig. II. On this downward movement of the outer end of the trip the inner end through the slot and pin 37 raises the plunger, as indicated, against'the pres- -sure of the spring 19 having its upper end bearing against the stationarily held washer 29 and its lower end bearing against the.

washer 40 on the plunger. lAs the plunger is raised this lower end 22 risesv above the passage 16 and allows the melange to flow onto the chamber 41 and through the disf charge assage 23 and spout.

be understood that ordinarily'the Itwi movement of the arm 4 is fairly rapid; consequently the latch but temporarily'engages the trip 34 before the continued downward movement forcing the same to spring back out of engagement therewith, which occurs but slightly after the parts reach the posi- In the operation lof my improvedmelange yfeed as the handle 5 is shifted -to bring the sage 16, as shouldbe clearly understood by reference to Fig. II. On releasing the drilll as the same moves into inoperative position the beveled upper face of the latch-35 will engage the beveled or inclined lower face of the trip 34 and the latch will be cammed backward against the tension of the spring 38 -without in anywise disturbing theplunger.

If it is desired on va particular lens to make use of a greater amount of melan e than that ordinarily employed, 1t is mere y'-4 `necessary to move the handle 5 and drill down slowly,- when the latch will hold the l trip and plunger raisedC for as long a period as may be desired, and the melange will =s`im`ply flow through the discharge spout in place of bein ejected therefrom.4 To shut oli' the flow, 1t is merely necessaryato continue the downward movement until the catch moves out of engagement with the' To vary the amount of fluid ordinarily discharged it is onlynecessary to raise or lower the cap plug 27 so that the trip will remain in engagement with the latch either a` longer or shorter period of time, according to the quantity of melange desired.

If preferred, .in place of ad1usting the cap plug 27 to regulate the amount of melange .dischargedI lmaf employ the set screw 42 carried by said'p u g, screwing downward of the screw limiting the upward movement of the plunger and thus restricting the amount of melange passing through the passage 16 and chamber 41 while raising of the screw permits further upward movement of the plunger and thus an increased flow of the melange.

From the foregoing description it will be seen that I have rovided a simple, inexpensive and practical construction which may be readily applied to drills now in use, or which may be constructed integral with a drill, if preferred, which will satisfactorily deliver a predetermined quantity of melange to a lens at a certain predetermined position in which 'the quantity delivered may be varied, as desired, by adjustment of the device, or may be varied merely by speed of manual operation in any particular instance and which will prove extremely eiicient an desirable in every particular.

I claim:

1. A mela-nge feed for a lens drilling machine, including a tank, a discharge spout for the tank, a combined valve and -`feed plunger controlling communication between the tank .and spout, means for resiliently forcing/the plunger into closed position, a trip carried by the tank and operatively engaging the plunger, andl a yieldlngly mounted, latch member carried by the drill and engaging the trip to operate the valve as the drill is moved in one direction, and

to yield without operating the plunger valve as the drill is moved in the opposite direction, substantially as illustrated.

2. rlChe combination with a lens drill having a reciprocating drilling member, of a melange tank secured to the drill, a tubular member mounted in the tank and having inlet and discharge apertures, a discharge spout in communication with the discharge aperture, a plunger valve within the tubular member serving to control passage of fluid from the tank through the inlet aperture and to forcibly eject the fluid from the discharge aperture, means for resiliently forcing the plunger valve into closed position, a head carried by the tubular member, a stop device and a trip carried by the head and adapted to engage the plunger valve to control its movemenuand a latch member carried by one of the reciprocating arts of the drill for engaging the trip member to actuate the plunger valve substantially as and for the purpose described.

ln a machine of scribed, a liquid retainer, an ejector valve therefor, an operating tool, means for advancing and retracting the tool, and means adapted to temporarily engage the valve and. hold the same open for a limited period l during the advance of the tool, said means being constructed Ato release the valve bedevice adapted to contact the character l dei fore the tool is advanced into operative po- Isecuring a discharge spout tothe tube, a

plunger valve within the tube adapted to control the discharge from the tube and when in depressed position to close the aperture near the lower end of the tube, a spring for normally holding the plunger valve in closed position, a head mounted on the upper end of the tube and provided with a pivoted trip member, the trip member and plunger valve having interlocking parts whereby rocking of the trip reciprocates the plunger, and a latch member on the drill shifting with and rock the trip member and thus temporarily actuate the plunger valve, substantially as described. y

In testimony whereof I ai'iX my signature in presence of two witnesses.

ALBERT E. MAYNARD. Witnesses:

H. K. PARSONS, C. FRED HILL.

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